Source code for invenio_files_rest.formparser

# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2016 CERN.
#
# Invenio is free software; you can redistribute it
# and/or modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307, USA.
#
# In applying this license, CERN does not
# waive the privileges and immunities granted to it by virtue of its status
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"""Werkzeug form data parser customization."""

from __future__ import absolute_import, print_function

from werkzeug import exceptions
from werkzeug.formparser import FormDataParser as WerkzeugFormDataParser


class FormDataParser(WerkzeugFormDataParser):
    """Custom form data parser."""

    def parse(self, stream, mimetype, content_length, options=None):
        """Parse the information from the given request.

        :param stream: An input stream.
        :param mimetype: The mimetype of the data.
        :param content_length: The content length of the incoming data.
        :param options: Optional mimetype parameters (used for
                        the multipart boundary for instance).
        :return: A tuple in the form ``(stream, form, files)``.
        """
        if options is None:
            options = {}

        parse_func = self.get_parse_func(mimetype, options)
        if parse_func is not None:
            # Check content length only if we are actually going to parse
            # the data.
            if self.max_content_length is not None and \
                    content_length is not None and \
                    content_length > self.max_content_length:
                raise exceptions.RequestEntityTooLarge()

            try:
                return parse_func(self, stream, mimetype,
                                  content_length, options)
            except ValueError:
                if not self.silent:
                    raise

        return stream, self.cls(), self.cls()